Co-existing 9i and 10g clients

I have a mobile application running on about 300 9i Lite clients on WinCE 3.01 syncing over GPRS with 9i Mobile Server and a 9i database. I'm planning to upgrade the clients to a WM5/6 device and want to avoid a big bang cutover.
My initial thought is to upgrade Mobile Server to 10gR3, keeping 9i DB and the existing devices on 9i Lite. I would then introduce 10g Lite clients in phases so that the 9i Lite clients would be replaced over a couple of months.
I've had various reponses from Oracle about how well 9i and 10g clients will co-exist against a 10g Mobile Server - the summary of which is that it should work but it's not recommended or supported.
Does anyone have experience of whether this is a viable production solution during the transition period? Or are there any better ways to do a phased client cutover?
Thanks.

I am in a similar predicament at the moment as well. I know they can co-exist, but I have run into issues on a win32/webtogo platform. I will update this post if I find a bullet proof way of doing it.

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